Dttijt tp a ttaxt



DEFENSIVE PU LiEATION UNITED STATES PATENT OFFICE Published at therequest of the applicant or owner in accordance with the Notice of Dec.16, 1969, 869 O.G. 687. The abstracts of Defensive Publicationapplications are identified by distinctly numbered series and arearranged chronologically. The heading of each abstract indicates thenumber of pages of specification, including claims and sheets ofdrawings contained in the application as originally flied. The files ofthese applications are available to the public for inspection andreproduction may be purchased tor 80 cents a sheet.

Defensive Publication applications have not been examined as to themerits of alleged invention. The Patent Oflice makes no assertion as tothe novelty of the disclosed subject matter.

PUBLISHED SEPTEMBER 29, 1970 T878,014 IMAGE FORMING METHODS AND MEANSGeorge K. Czarnikow, 901 Elmgrove Road, Rochester, N.Y. 14650 Filed Mar.7, 1969, Ser. No. 805,173 int. Cl. G03g 13/02 US. Cl. 355-17 1 SheetDrawing. 4 Pages Specification Apparatus and methods are provided forinduction charging of a receiver having a photoconductive surface.Proper spacing between the photoconductive surface of the receiver and aconductive surface of an electrode is obtained in one embodiment byproviding a photoresist insulative dot pattern on the electrode so thatair ionization will take place in the spaces surrounding the photoresistdot pattern during application of a potential between the electrode anda conductive backing on the receiver. Simultaneous or subsequentimagewise exposure will result in an electrostatic image which can betoned to form a half-tone image. In another embodiment thephotoconductive surface is made with irregularities which give it aroughness that provides proper spacing for ionization of air between theelectrode and the remainder of photoconductive surface. Exposure of thephotoconductor may be made through the electrode, which may betransparent, either concurrently with or subsequent to the chargingstep.

Sam. 29, 397 T78,0M

G. K. CZARNIKOW IMAGE FORMING METHODS AND MEANS y Filed March 7, 1969'FEGJ I GE PEG-2 m f 44am ATTORNEYS

